package br.ufpe.cin.redes.servlets.filters;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 
 * Filtro de login.
 *
 */
public class LoginFilter implements Filter
{ 

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
	      HttpServletRequest req = (HttpServletRequest) request;  
	      HttpServletResponse res = (HttpServletResponse) response;         
	      HttpSession session = req.getSession();  
	      String user = (String) session.getAttribute("logado");  
	      if(!(user!=null && user.trim().length()>0))
	      {  
	    	  res.sendRedirect("/logar.jsp");  
	      }  
	      else
	      {
	    	  chain.doFilter(req, res);
	      }
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

} 
